<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var password=prompt('请输入密码');
    if(password==='admin'){
      alert('密码输入正确')
    }else{
      alert('密码输入错误')
    }
  </script>
  
</body>
</html>